Bronzing attachment for printing-presses.



A. P. BROOKS.

BRONZING ATTACHMENT FOR PRINTING PRESSES.

APPLICATION FILED SEPT. v, 1911. RENEWED NOV. 16, .1914.

L 1 3mm Patented Mar. 30, 1915.

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A. P. BROOKS.

BRONZING ATTACHMENT FOR PRINTING PRESSES.

APPLIGATION FILED SEPT.7,1911. RENEWED NOV.16,1914.

L13$fi5 Patented Mar. 30, 1915.

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A. P. BROOKS.

BRONZING ATTACHMENT FOR PRINTING PRESSES.

APPLICATION FILED SEPT. 7, 1911, RENEWED NOV.16,1914.

Patented Mar. 30, 1915.

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earns arr ASA P. BROOKS, 0F MINNEAPOLIS, MINNESOTA, ASSIGNOR T0 IDA V. GLASS, OF,

MINNEAPOLIS, MINNESOTA.

BRONZING ATTACHMENT FOR PRINTING-PRESSES.

Specification of Letters Patent.

Patented Mar. 3 1), 1915..

Application filed September 7, 1911, Serial No. 648,176. Renewed November 16, 1914. Serial No. 872,502.

To all whom it may concern:

Be it known that I, ASA P. Bnoons, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Bronzing Attachments for Printing-Presses; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its particular object the provision of a simple and highly efficient attachment for printing presses, by the use of which, bronze or other dry powdered printing material may be applied as the printing medium.

To the above ends, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a fragmentary view in side elevation showing portions of a printing press of the type generally designated as a j ob press and illustrating my improved bronzing attachment, so-called, applied thereto, and showing the bronzing ribbon drawn into an operative po sition; Fig. 2 is a view corresponding to Fig. 1, but showing the bronzing ribbon in its normal or retracted position; Fig. 3 is an elevation with some parts broken away, looking at certain of the parts shown in Fig. 2 in a direction from the right toward the left; Fig. 4 is a plan view with parts broken away, showing the bronzing attachment removed from working position; Fig. 5 is a transverse section taken on the line 50 of Fig. 4; and Fig. 6 is a detail view showing, partly in full plan view and partly in dotted lines, a device for vibrating or tapping the bronze containing magazine.

Of the parts of the press, the numeral 1 indicates the press frame, a portion only of which is shown; the numeral 2 indicates the bed which is oscillated through links 3 and is provided with depending legs that are pivoted to the frame 1; the numeral 4 indicates the so-called roller arms which are 0scillated through links 5; the numeral 6 indicates the inking plate or disk mounted in the usual way on a yoke-like cross bar 7 the legs of which are rigidly secured to the bed 2; and the numeral 8 indicates a type chase carried by and connected to the bed 2 in the customary way.

The bronzing attachment comprises a ribbon, means for moving the ribbon automatically to and from a position between the type and the platen, and means for sifting or evenly distributing the dry powdered bronze or similar material upon the ribbon. In applying the attachment to a press of the type illustrated, it is preferably constructed and arranged as illustrated in the drawings, and as will now be described. The ribbon 9, which is a soft wide-faced ribbon, approximating a sheet, is normally attached to and wound upon an automatically spring retracted roller 10, shown as journaled at its ends in a box-like casing 11. This casing 11 may be supported in different ways, but, as shown, is provided with upwardly extended metal straps 12 that are detachably clamped to arms 13 secured to and depending from the lower portion of the chase 8. Four guide rollers 14, 15, 16 and 17 are extended parallel to the roller 10 and are journaled at their ends to the end walls of the casing 11. The roller 14 is located'above the automatically wound roller 10, and its shaft, at one end, is provided with a spur gear 18. The ribbon is drawn upward and unwound from the roller 10, and thereby moved in front of or over the face of the type in the chase 8, by connection with a suitable moving part of the press, such, for instance, as the socalled roller arms 4. This connection, as shown, includes a pair of flexible straps 20, the upper ends of which are attached to and wound upon a pair of'sheaves or drums 21 secured on a shaft 22 journaled to the legs of the cross bar 7 of the bed 2. This shaft 22 has smaller drums 23. Flexible straps 24, at their inner ends are attached to and wound upon small drums 23, and at their outer ends are attached to anchor clips 25 that are secured on the outer portions of the roller arms 4. The shaft 22 and its drums 21 and 23 afford a sort of a differential roller which increases the movement of the ribbon. The ribbon, from the roller 10, is passed over the roller 14, thence under the roller 15, and takes a zigzag course between the rollers 16 and 17.

Located above the roller 14;, and suitably secured to the casing 11, is a hopper 26 which, in its bottom, has a narrow passage extended from end'to end thereof, and closed only by a fine wire gauze 27. This hopper contains the dry powdered bronze y, or similar material, and which is to be sifted upon the ribbon 9, when the ribbon is moved. To cause the hopper to drop the powdered bronze upon the ribbon, an agitation is required and this is best produced by Wrapping the hopper, and mounting the hopper so that it may move slightly. As shown, the said hopper is provided on its long side with depending pairs of fingers or lugs 26 that embrace the adjacent edge of the casing 11, and thereby detachably hold the hopper in position while permitting slight endwise sliding movements thereof. Also, the hopper is preferably provided with a depending spring 28 and a stop 29 at one end, which engage, respectively, inner and outer surfaces of the adjacent end Wall of the casing 11. The other end of the hopper is adapted to be intermittently tapped or struckby a head 30 of a springpressed hammer lever 31, pivoted, as shown, to a bracket 32 secured to the adjacent end of the casing 11. On the under side of the hammer lever 31 is a depending lug 33 that is adapted to be engaged'by an oblique segmental cam flange 34 carried by a cam wheel or head 35 securedto the inner end of a short shaft 36 journaled in a suitable bearing on the adjacent head of the casing 11. At its outer end, the shaft 36 is provided with a spur gear 19 that meshes with the gear 18 of the roller 14. A gravity-held retaining pawl 37 pivoted to one end of the casing 11 engages theteeth of the gear 19, and while it permits free rotation of the said gear 19, when the ribbon 9 is drawn upward into an operative position, holds the said gear 19 against backward movement when the ribbon is retracted or drawn' backward to its normal or inoperative position; hen the ribbon is thus drawn backward, it will be automatically wound upon the roller 10, and as there is no tension on the ribbon, the said ribbon will be freely drawn over the roller 14;, which at that time is locked to the gear 19, and hence, against backward rotation. V

From the description so far given, it is evident that, once for each oscillating movement of the roller arms 4, and at times just before the type in the chase 8 are forced against the platen, the ribbon will be drawn Copies of this patent may be obtained for upward in front or over the face of the type, and hence, in position to produce the print in bronze on the paper carried by the platen. Also, it is evident, that for each such movement of the ribbon, the springpressed hammer will be several times retracted and then released and permitted to rap or pound against the end of the hopper 26. For each rap or tap thus given to the hopper, a fine shower of the powdered bronze will be precipitated onto the ribbon which is then being drawn under the hopper and in this way, the ribbon is kept supplied with the powdered bronze. Inasmuch as the gear 19, and hence the cam 3435 is locked against backward movement when the ribbon is wound upon its roller 10, there will be no rapping or tapping of the hopper under such movement.

As already indicated, this improved socalled bronzing attachment may be used to supply various different kinds of dry powdered or pulverized printing materials to a ribbon, and that the ribbon actuating means and associated devices may take various forms within the broad scope of this invention.

lVhat I claim is:

1. The combination with a printing press, of a printing attachment therefor comprising a ribbon constituting an element of said press connected to a movable part of said press and moved thereby with a timed action, a hopper adapted to contain and discharge dry powdered printing material, and a hopper tapping device operated by movements of the ribbon and directly engagcable with said hopper, substantially as described.

2. The combination with a printing press, of a printing attachment therefor, comprising a ribbon constituting an element of said press connected to a movable part of said press for movement with a timed action, yielding means tending to retract and roll said ribbon, a hopper overlying a portion of said ribbon and adapted to deliver dry powdered printing material onto said ribbon, and means actuated by movement of the ribbon for agitating the material in said hopper and causing a deposit thereof on said ribbon.

In testimony whereof I aflix my signature in presence of two witnesses.

ASA P. BROOKS.

Witnesses:

MILDRED L. MUMMA, HARRY D. KILGORE.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

